結果

問題 No.1103 Directed Length Sum
ユーザー mikianaaamikianaaa
提出日時 2020-08-20 15:51:21
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 1,853 bytes
コンパイル時間 1,614 ms
コンパイル使用メモリ 175,700 KB
実行使用メモリ 89,600 KB
最終ジャッジ日時 2024-10-13 11:57:13
合計ジャッジ時間 9,753 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge2
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
5,248 KB
testcase_01 AC 2 ms
5,248 KB
testcase_02 WA -
testcase_03 AC 258 ms
89,600 KB
testcase_04 AC 495 ms
46,720 KB
testcase_05 AC 984 ms
78,592 KB
testcase_06 AC 273 ms
31,616 KB
testcase_07 AC 37 ms
9,984 KB
testcase_08 AC 63 ms
13,568 KB
testcase_09 AC 23 ms
7,552 KB
testcase_10 AC 94 ms
17,408 KB
testcase_11 AC 543 ms
50,560 KB
testcase_12 AC 272 ms
31,872 KB
testcase_13 AC 104 ms
17,920 KB
testcase_14 AC 18 ms
6,400 KB
testcase_15 AC 187 ms
25,600 KB
testcase_16 AC 632 ms
56,576 KB
testcase_17 AC 682 ms
58,744 KB
testcase_18 AC 101 ms
17,408 KB
testcase_19 AC 577 ms
51,900 KB
testcase_20 AC 28 ms
8,320 KB
testcase_21 AC 53 ms
12,672 KB
testcase_22 AC 424 ms
43,008 KB
testcase_23 AC 200 ms
27,136 KB
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コンパイルメッセージ
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/x86_64-pc-linux-gnu/bits/c++allocator.h:33,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/bits/allocator.h:46,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/string:41,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/bits/locale_classes.h:40,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/bits/ios_base.h:41,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/ios:42,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/istream:38,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/sstream:38,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/complex:45,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/ccomplex:39,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/x86_64-pc-linux-gnu/bits/stdc++.h:54,
                 from main.cpp:2:
In member function 'void std::__new_allocator<_Tp>::construct(_Up*, _Args&& ...) [with _Up = long long int; _Args = {const long long int&}; _Tp = long long int]',
    inlined from 'static void std::allocator_traits<std::allocator<_CharT> >::construct(allocator_type&, _Up*, _Args&& ...) [with _Up = long long int; _Args = {const long long int&}; _Tp = long long int]' at /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/bits/alloc_traits.h:516:17,
    inlined from 'void std::deque<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]' at /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/bits/stl_deque.h:1543:30,
    inlined from 'void std::queue<_Tp, _Sequence>::push(const value_type&) [with _Tp = long long int; _Sequence = s

ソースコード

diff # 

#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
#define ll long long
#define ld long double
#define INF 1000000000000000000
typedef pair<ll, ll> pll;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;
    ll MOD = pow(10, 9) + 7;
    vector<vector<ll>> G(N, vector<ll>());
    vector<ll> root(N, -1);
    rep(i, N - 1) {
        ll a, b;
        cin >> a >> b;
        a--, b--;
        G[a].push_back(b);
        G[b].push_back(a);
        root[b] = a;
    }

    ll s;
    rep(i, N) {
        if (root[i] == -1) {
            s = i;
            break;
        }
    }

    vector<ll> dist(N, -1); // 全頂点を「未訪問」に初期化
    queue<ll> que;

    // 初期条件 (頂点 0 を初期ノードとする)
    dist[s] = 0;
    que.push(s); // 0 を橙色頂点にする

    // BFS 開始 (キューが空になるまで探索を行う)
    while (!que.empty()) {
        int v = que.front(); // キューから先頭頂点を取り出す
        que.pop();

        // v から辿れる頂点をすべて調べる
        for (int nv : G[v]) {
            if (dist[nv] != -1)
                continue; // すでに発見済みの頂点は探索しない

            // 新たな白色頂点 nv について距離情報を更新してキューに追加する
            dist[nv] = dist[v] + 1;
            dist[nv] %= MOD;
            que.push(nv);
        }
    }

    ll ans = 0;
    rep(i, N) {
        ll tmp = dist[i] % MOD;
        if (dist[i] >= 2) {
            tmp = (1 + dist[i]) % MOD * dist[i] % MOD / 2;
        }

        ans += tmp;
        ans %= MOD;
    }

    if (ans < 0) {
        while (ans < 0) {
            ans += MOD;
        }
    }

    cout << ans << endl;
}
0